139169109 has 8 divisors (see below), whose sum is σ = 185621760. Its totient is φ = 92747936.

The previous prime is 139169081. The next prime is 139169119. The reversal of 139169109 is 901961931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139169109 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139169119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5884 + ... + 17690.

It is an arithmetic number, because the mean of its divisors is an integer number (23202720).

Almost surely, 2^139169109 is an apocalyptic number.

It is an amenable number.

139169109 is a deficient number, since it is larger than the sum of its proper divisors (46452651).

139169109 is a wasteful number, since it uses less digits than its factorization.

139169109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15739.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 139169109 is about 11796.9957616336. The cubic root of 139169109 is about 518.2201339725.

It can be divided in two parts, 1391 and 69109, that added together give a triangular number (70500 = T₃₇₅).

The spelling of 139169109 in words is "one hundred thirty-nine million, one hundred sixty-nine thousand, one hundred nine".